ABB SC520 3BSE003816R1 After sales service is provided for the control card of the power supply device

Description

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The specific functions for generator protections are described below, for each of which it is possible to choose the operating
mode: active, only alarm or deactivated. All the voltage and frequency protections also operate when the circuit-breaker is
open, enabling the fault to be identified before the closing of the circuit-breaker.
Voltage controlled overcurrent protection (S(V) – ANSI 51V): protection from maximum current with
constant trip time (t = k) that is sensitive to the voltage value. The set current threshold, following a
voltage drop, decreases by steps or linearly.
In step mode (controlled mode) the protection is tripped at the set threshold (I20) if the voltage is above
U, whereas it is tripped at the lower threshold of the factor Ks (I20 * Ks) if the voltage is below U.
On the other hand, in linear mode (restrained mode) two voltage limits are selected within which the
protection is tripped at the set threshold (I20) reduced by the factor K corresponding to the measured
voltage. The variation of the factor K is proportional to the voltage, and for voltages greater than the upper
threshold (Uh) the threshold I20 works, whereas for voltages below the lower threshold (UI) the minimum
threshold (I20 * Ks) applies.
Residual overvoltage (RV – ANSI 59N): with constant trip time (t = k), protects against insulation loss in
systems with insulated neutral or with neutral earthed with impedance.